bump: v0.2.8.2

Version lockstep across server, agent, docker-compose, helper.

docker-compose.yml

@@ -21,7 +21,7 @@ services:
       context: .
       dockerfile: ./server/Dockerfile
       args:
-        BUILD_VERSION: ${BUILD_VERSION:-0.2.8.1}
+        BUILD_VERSION: ${BUILD_VERSION:-0.2.8.2}
     container_name: redflag-server
     volumes:
       - server-config:/app/config

server/internal/version/versions.go

@@ -15,8 +15,8 @@ import (
 // tag — the release gate enforces this. ldflags may override at build time;
 // the release pipeline injects the tag so binaries and source agree.
 var (
-	AgentVersion    = "0.2.8.1"
-	ConfigVersion   = "0.2.8.1"
+	AgentVersion    = "0.2.8.2"
+	ConfigVersion   = "0.2.8.2"
 	MinAgentVersion = "0.1.22"
 )